And while im going on a rampage of ideas i think might be cool for the game, More seasons might be cool too.
Certain map types can have longer or shorter seasons, or permanent seasons. Or only some of the seasons for that matter. This would be customizeable on the Sandbox mode.
Example of a season could be Summer where Solar Output is 150%, Crop growth is 150% but water consumption is 200%
Fall where conditions are relatively normal but storms are more likely to occur. Or perhaps people are more prone to getting sick if the colony has any External Air Intake Filters.
Spring could also have positive benefits like reduced need for happiness producing buildings or just a passive boost to happiness while its spring time. Spores might be more likely to spread.